liquid crystalline behaviour of thienyl-enaminoketone derivatives containing halogen atoms

New homologous series containing a thienyl-enaminoketone-phenyl (TEP) core substituted by a halogen atom have been synthesized. It is shown that the s tability of the orthogonal phases decreases with the decreasing electron-ac cepting properties of the halogen atom. Generally the materials studied for m orthogonal smectic phases, but in additional, tilted smectic phases are o bserved in iodine-substituted series as well as for two homologues containi ng bromine in the thienyl ring. For comparison, a homologous series contain ing a terminal cyano group was also studied.